Aliens: Colonial Marines Xenomorph Boiler 1:18 Scale Action Figure - Previews Exclusive The Boiler is a Xenomorph caste, first encountered by the Colonial Marines from the U.S.S. Sephora on LV-426. It possesses a unique form of attack, whereby it will forgo the typical melee or spitting attacks used by other Xenomorphs in favor of suicidally rupturing its own body, drenching nearby targets in huge quantities of acidic blood. The Aliens Xenomorph Boiler 1:18 Scale Action Figure - Previews Exclusive stands approximately 4-inches tall and comes with an egg, a face-hugger, and three sets of hands.